Self-compacting concrete beams reinforced with steel fiber under flexural loads: A ductility index evaluation

Odaa, Sief aldeen; Hason, Mahir M.; Sharba, Amjad Ali K.

doi:10.1016/j.matpr.2020.12.313

Cited by 19 publications

(6 citation statements)

References 17 publications

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“…The test has been done for cylinders with dimensions of 100 mm in diameter and 200 mm in length to evaluate the splitting tensile strength (ft) according to ASTM C496-11 [32] and for cubes with dimensions of 100X100X100 mm to evaluate the cube compressive strength (fcu) according to BS 1881-116 1983 [33]. Cube compressive strength (fcu) N/mm 2 .…”

Section: Mechanical Properties Of the Hardened Concretementioning

confidence: 99%

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Shakir,

Alghazali

2024

Preprint

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Three new sustainable models of a hybrid deep beam have been proposed in this work, which are the curved (CRV) and the arched (ARC1) and the modified arched (ARC2) in addition to the conventional (HRL) hybrid model that uses recycled coarse aggregates (RCA) instead of natural aggregates. The specimens indicate that steel fiber concrete (SFC) is used in high stress concentration areas and sustainable concrete is used in other areas. In relation to the parameters, the effects of hybridization types and inclined stirrups have all been studied. Results revealed that the failure capacity was increased by 8%, 22%, 21%, and 22%, for the for hybrid models respectively. On the other hand, the specimen (CTRL-SFC) showed a 19% enhancement. Regarding the flexural toughness, enhancement in 13%, 39%, 34%,71% for the hybrid models respectively compared to the non-hybrid model (CTRL-R50).The respective enhancement for the specimen (CTRL-SFC) was 52%.For the effective stiffness, results showed small range of enhancement (1.5-9)%. It is evident that the specimens' internal reinforcement detailing is adequate to stop the semi-diagonal mode of failure, which is an extremely brittle mode of failure. Furthermore, a replacement rate of up to 50% does not significantly affect the overall response. Moreover, The results of the tests indicated that the inclined alignment of the stirrups prevented diagonal cracking more than their vertical alignment. The proposed curved and arched models may be used with multi-concentrated loads, prestressed beam, precast walls. The proposed models aimed to produce lightweight / sustainable /low cost /high performance precast deep beams with compared to the horizontal hybrid model.

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Section: Mechanical Properties Of the Hardened Concretementioning

confidence: 99%

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Shakir,

Alghazali

2024

Preprint

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“…Siefaldeen Odaa et-al [34], have examined and analyzed the ductility index in terms of absorbed energy in SFRSCC under flexural stress. Under flexural loads, twelve reinforced SCC beams, divided into two groups of six beams, were evaluated (with and without steel fibers).…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Self-Compacting Concrete Beams with Steel Fiber Reinforcement with B500 Ribbed Rebar

sadek,

abdelatif

2023

Journal of Advanced Engineering Trends

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This research aimed to study the bending behavior of self-compacting concrete (SCC) beams reinforced with steel fiber and B500 ribbed reinforcing bar. The studied variables were four: cracking patterns and failure mode, effect of main reinforcement area, effect of rebar grades, and effect of fiber content. Six rectangular beams of cross section of size 100×200 mm and a length of 2000 mm were casted and tested under four-point bending. One beam was used as a control beam without steel fibers, while the other five beams were casted using steel fibers. The steel fiber content was varied from zero to 25 and 50 kg/m 3 . Three types of rebar main reinforcement were used B500DWR, B500CWR, and B500C-R. According to the experimental results, the tensile strain at failure load ranged from 64,4.7 and 99.2% of that of control beam B1 and the compressive strain at failure load was 76.2 % and 57.1 % of that of beam B1, the control beam. The failure load for beams were 101.5.3 and 106.7 % of that of the control beam B1. Changing the main reinforcement for beams lead to the maximum deflection for beams ranged from 101.5, 109.9, and 81.3% of that of the control beam.

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“…Compressive strength, on the other hand, causes concrete to become more brittle [1]. Steel fibers can improve section behavior [2,3], since they provide a bridging action across matrix microcracks and improve crack opening resistance [4]. Steel fibers' ability to cross microcracks is greatly influenced by the shear stress at the interface between the fibers and the matrix (bond strength between steel fibers and the matrix).…”

Section: Introductionmentioning

confidence: 99%

The Behavior of Hybrid Fiber-Reinforced Concrete Elements: A New Stress-Strain Model Using an Evolutionary Approach

et al. 2022

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Several stress-strain models were used to predict the strengths of steel fiber reinforced concrete, which are distinctive of the material. However, insufficient research has been done on the influence of hybrid fiber combinations (comprising two or more distinct fibers) on the characteristics of concrete. For this reason, the researchers conducted an experimental program to determine the stress-strain relationship of 30 concrete samples reinforced with two distinct fibers (a hybrid of polyvinyl alcohol and steel fibers), with compressive strengths ranging from 40 to 120 MPa. A total of 80 % of the experimental results were used to develop a new empirical stress-strain model, which was accomplished through the application of the particle swarm optimization (PSO) tech-nique. It was discovered in this investigation that the new stress-strain model predictions are consistent with the remaining 20% of the experimental stress-strain curves obtained. Case studies of hybrid–fiber–reinforced concrete constructions were investigated in order to better understand the behavior of such elements. The data revealed that the proposed model has the highest absolute relative error (ARE) frequencies (ARE10 % and the lowest absolute relative error (ARE > 15 %) frequencies (ARE > 15 %).

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Self-compacting concrete beams reinforced with steel fiber under flexural loads: A ductility index evaluation

Cited by 19 publications

References 17 publications

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Sustainable precast composite deep beams including concrete with partial replacement (50%) of recycled coarse aggregate

Flexural Behavior of Self-Compacting Concrete Beams with Steel Fiber Reinforcement with B500 Ribbed Rebar

The Behavior of Hybrid Fiber-Reinforced Concrete Elements: A New Stress-Strain Model Using an Evolutionary Approach

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